Q.The focal length of a biconvex lens is 10 cm.Find the radius of carvature.When we apply the formula R=2f,we get 20 cm,but if we apply the lens maker formula we get 10 cm(taking R.I.=1.5) .Please explain these contradictory results.Please help!!!


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 Sunindra Kanghujam

3 years ago

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